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Site Report: Hanna Car Wash (former Super Suds)

Site Name: Hanna Car Wash (former Super Suds)
Address: 180 Muldoon Rd.; , Anchorage, AK 99504
File Number: 2100.26.204
Hazard ID: 23821
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.222681
Longitude: -149.734021
Horizontal Datum:NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

In 1989 petroleum contaminated soil and groundwater during a site investigation that consisted soil and groundwater sampling of five soil borings and three monitoring wells (MW-1, MW-2, and MW-3). This property has operated as a gas station from 1967 to 1999. In 1991 two additional monitoring wells (MW-4 and MW-5) were installed to help define the extent of the soil and groundwater contamination at the site. In 1999 soil and groundwater contamination was encountered during the removal of nine underground storage tanks and their associated piping and dispensers. 144 cubic yards of contaminated soil was removed and thermally treated at ASR. Soil contamination over cleanup levels is left at the western tank excavation at 10.5 to 22 feet below ground surface, the central tank and dispenser area at 15 to 24 feet below ground surface, and near the northern property boundary at 20 to 24 feet below ground surface. In 2001 two soil borings and two long-term monitoring wells (MW-6 and MW-7) were sampled to help define the extent of the remaining soil and groundwater contamination at this site. In 2002 additional monitoring wells and soil borings were installed to help define the extent of the remaining soil and groundwater contamination. In 2003 ten soil borings, four long-term monitoring wells (MW-8, MW-9, MW-10, and MW-11), and three short-term monitoring wells were sampled to help define the extent of the remaining soil and groundwater contamination at this site. In 2015 seven soil borings were sampled to help assess current soil contamination concentrations at the site with up to 545 mg/kg GRO, 619 mg/kg DRO, 2.37 mg/kg benzene, 7.34 mg/kg 2-methylnapthalene, and 2.15 mg/kg naphthalene in the soil samples collected. Vapor intrusion sampling in 2023 indicated petroleum compounds were not migrating into the car wash at unacceptable levels. Some compounds were detected indoors which appeared to be associated with the car wash operations. Groundwater generally flows to the north by northwest. Based on the most recent data, the groundwater meets Table C cleanup levels and the site was closed in 2024.

Action Information

Action Date Action Description DEC Staff
6/13/1989 Site Added to Database Former Staff
6/13/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77983 ADD; Former Staff
6/13/1989 Underground Storage Tank Site Characterization or Assessment A site visit by ADEC discovered spills due to overfills near 4 USTs. Former Staff
12/13/1989 Document, Report, or Work plan Review - other In December 1989 five soil borings and three long-term monitoring wells (MW-1, MW-2, and MW-3), were sampled to help assess for soil and groundwater contamination at this site. The soil and groundwater samples were analyzed for BTEX and TPH(RRO). Up to 0.026 mg/kg benzene and 348 mg/kg TPH in the soil samples collected. Up to 401 ug/l benzene, 25 ug/l toluene, 64 ug/l ethylbenzene, and 154 ug/l xylenes in the groundwater samples collected. Former Staff
7/2/1990 Document, Report, or Work plan Review - other Petroleum hydrocarbon assessment: monitoring well#4 groundwater sample had 13ppm Benzene, 44ppm Toluene, 7.4ppm Ethylbenzene, & 28ppm Xylenes. Former Staff
7/17/1990 Leaking Underground Storage Tank Corrective Action Underway Reviewed July 1990 Petroleum Hydrocarbon Assessment report that indicated elevated levels of petroleum contamination at the property. Need written remedial action plan addressing this contamination. Also need additional assessment work to the north of the site to determine horizontal extent of plume. Former Staff
4/23/1992 Document, Report, or Work plan Review - other Drinking water wells search conducted in July 1991 identified eleven drinking water wells within 1/4 mile of the Hanna Car Wash property. Robert Weimer
4/23/1992 Document, Report, or Work plan Review - other In June 1991 two soil borings and two long-term monitoring wells (MW-4 and MW-5), were sampled to help define the extent of the remaining soil and groundwater contamination at this site. The soil samples were analyzed for BTEX, VPH(GRO), EPH(DRO), and TPH(RRO). Up to 170 mg/kg VPH, 15 mg/kg EPH, and 140 mg/kg TPH in the soil samples collected. Up to 9.5 ug/l benzene, 16.0 ug/l toluene, 67 ug/l ethylbenzene, and 92.0 ug/l xylenes in the groundwater samples collected which were only analyzed for BTEX. Robert Weimer
7/13/1992 Document, Report, or Work plan Review - other FDIC sent over reports on this site including: Site assessment, March 1990; Water Well Records Review, July 1991; Water Well Records Review, July 1991; Limited Risk Assessment, Aug. 1991; Underground Storage Tank Tightness Testing Report; Letter from Hart-Crowser to Muldoon Mini Storage, Dec. 30, 1991; Letter from Hart-Crowser to FDIC ref. Muldoon Mini Storage, Feb. 3, 1991; Letters about the site from 1991. Issues: The cause and location of original spill needs to be determined; The full extent of soil and groundwater contamination needs to be determined; The releases from the site may contaminate drinking water sources in the area; The drinking water well at Muldoon Mini Storage still needs to be tested. Former Staff
7/13/1992 Update or Other Action ADEC sent letter to James W. Collins (RP) requesting workplan by August 15, 1992, with copies to FDIC which holds a security interest. Mr. Collins responded in letter received Aug. 14, 1992 that he has no financial resources to deal with the site. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: COLLINS/BOYER ESTATE Former Staff
9/19/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Contamination found in August 1999 during the removal of nine underground storage tanks and their associated piping and dispensers. Up to 47.1 mg/kg lead, 1,580 mg/kg RRO, 565 mg/kg DRO, 42.6 mg/kg GRO, and 0.145 mg/kg benzene in the soil samples collected from the final excavation. 144 cubic yards of contaminated soil was excavated, stockpiled on the property until it was transported to ASR for thermal treatment. Former Staff
3/16/2001 Update or Other Action Conditional approval of 3/13/01 work plan for drilling investigation. Linda Nuechterlein
3/28/2001 Document, Report, or Work plan Review - other Between March 26-28, 2001 two soil borings and two long-term monitoring wells (MW-6 and MW-7), were sampled to help define the extent of the remaining soil and groundwater contamination at this site. The soil and groundwater samples were analyzed for BTEX, GRO, DRO, and RRO. One of the soil samples (BH-7 at 19' below ground surface) and one of the groundwater samples (MW-7) were also analyzed for PAHs. Up to 1.81 mg/kg benzene, 360 mg/kg GRO, 1,230 mg/kg DRO, and 8.41 mg/kg Naphthalene in the soil samples collected. Up to 16.2 ug/l benzene, 11.9 mg/l GRO, 6.49 mg/l DRO, and 136 ug/l Naphthalene in the groundwater samples collected. The other PAH's are below 2018 soil and groundwater cleanup levels. Robert Weimer
10/10/2002 Update or Other Action Approval of 10/8/02 workplan for additional soil borings and monitoring well installation. Robert Weimer
2/7/2003 Document, Report, or Work plan Review - other Between February 5-7, 2003 ten soil borings, four long-term monitoring wells (MW-8, MW-9, MW-10, and MW-11), and three short-term monitoring wells were sampled to help define the extent of the remaining soil and groundwater contamination at this site. The soil and groundwater samples were analyzed for BTEX, GRO, DRO, and RRO. Up to 0.178 mg/kg benzene, 55.7 mg/kg GRO, 547 mg/kg DRO, and 4,370 mg/kg RRO in the soil samples collected. Up to 8.36 ug/l benzene, 3.54 mg/l GRO, and 1.14 mg/l DRO in the groundwater samples collected. Robert Weimer
4/7/2003 Document, Report, or Work plan Review - other In April 2003 an updated drinking water well search was conducted. The search didn't identify any new drinking water wells since the previous drinking water wells search conducted in July 1991 which identified eleven drinking water wells within 1/4 mile of the Hanna Car Wash property. Robert Weimer
7/1/2003 Update or Other Action Approved corrective action plan for the installation of an air-sparge system. Robert Weimer
11/10/2003 Update or Other Action Approved 11/7/03 revision to the corrective action plan. Robert Weimer
4/1/2004 Update or Other Action Approved groundwater sampling plan. Robert Weimer
5/20/2004 Update or Other Action Review file to check remaining contamination levels in soil and groundwater. Up to 1.81 mg/kg benzene in the soil. The highest levels are near MW-7 and BH-4 at 19 to 22 feet below ground surface. Soil contamination over default cleanup levels is located at the western tank excavation (10.5 to 22 feet below ground surface), central tank and dispenser area (15 to 24 feet below ground surface), and near northern property boundary (20 to 24 feet below ground surface). Robert Weimer
5/27/2004 Update or Other Action Meeting to discuss further site work: wells to be decommissioned, future confirmation sampling of soil and groundwater. Robert Weimer
6/3/2004 Update or Other Action Letter conditionally approving decommissioning all monitoring wells except mw-7, mw-26, mw-8, and mw-9. Also approved proper disposal of contents of 19 drums of soil and liquid. Did not approve ORC injection due to higher DO levels already in the groundwater. Robert Weimer
6/15/2004 Document, Report, or Work plan Review - other On June 9, 2004 monitoring wells MW-2, MW-4, and MW-10 were decommissioned in accordance with a DEC approved work plan. Robert Weimer
8/4/2004 Document, Report, or Work plan Review - other June 15, 2004 report documenting the decommissioning of select monitoring wells and disposal of drums of liquids and soils. Robert Weimer
12/13/2004 Document, Report, or Work plan Review - other September 20, 2004 groundwater monitoring event. Up to 7.63 mg/l GRO, 2.49 mg/l DRO, and 34.2 ug/l benzene were found in the groundwater. The contamination levels appear to be increasing. The groundwater was at 15 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
8/15/2005 Document, Report, or Work plan Review - other June 20, 2005 groundwater monitoring event. Up to 2.69 mg/l GRO, 0.952 mg/l DRO, and 7.11 ug/l benzene were found in the groundwater. The contamination levels appear to be decreasing. The groundwater was at 15 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
12/9/2005 Update or Other Action ADEC requests one more semi-annual groundwater monitoring event to evaluate trends for future monitoring and possible conditional closure. Robert Weimer
2/22/2006 Update or Other Action Because of increasing contamination levels ADEC requests a Fall 2006 groundwater monitoring event to evaluate trends for future monitoring and possible conditional closure. ADEC requests that monitoring well MW-7 and MW-26 be sampled for BTEX and GRO. Robert Weimer
2/22/2006 Document, Report, or Work plan Review - other January 4, 2006 groundwater monitoring event. Up to 3.56 mg/l GRO, 0.725 mg/l DRO, and 15.1 ug/l benzene were found in the groundwater. The contamination levels appear to be increasing. The groundwater was at 14 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
8/10/2006 Document, Report, or Work plan Review - other June 13, 2006 groundwater monitoring event. Up to 3.34 mg/l GRO, 1.38 mg/l DRO, and 11.8 ug/l benzene were found in the groundwater. The contamination levels for GRO and benzene have decreased from the previous sampling event. The groundwater was at 14 to 15 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
11/27/2006 Update or Other Action ADEC request continued semi-annual groundwater sampling. Contamination concentrations remain elevated over the 2005 levels. Robert Weimer
4/18/2008 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
5/2/2008 Document, Report, or Work plan Review - other December 6, 2006 groundwater monitoring event. Up to 2.2 mg/l GRO, 1.07 mg/l DRO, and 22.2 ug/l benzene were found in the groundwater. The contamination levels for benzene have increased from the previous sampling event. The groundwater was at 13.36 to 13.83 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
5/2/2008 Document, Report, or Work plan Review - other Conceptual Site Model (CSM) identifies soil and groundwater ingestion, dermal soil and groundwater, inhalation of volatiles from groundwater, an inhalation of volatiles in outdoor and indoor air as potential pathways. Robert Weimer
9/8/2008 Document, Report, or Work plan Review - other October 17, 2007 groundwater monitoring event. Up to 2.06 mg/l GRO, 0.868 mg/l DRO, and 13.1 ug/l benzene were found in the groundwater. The contamination levels have decreased from the previous sampling event. The groundwater was at 13.45 to 14.28 feet below ground surface and flows toward the north. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
6/15/2009 Update or Other Action May 14, 2008 groundwater monitoring event. Up to 2.69 mg/l GRO, 0.807 mg/l DRO, and 1.0 ug/l benzene were found in the groundwater. The GRO contamination levels have increased from the previous sampling event in one monitoring well. The groundwater was at 13.07 to 13.96 feet below ground surface and flows toward the north by northwest. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
6/15/2009 Update or Other Action ADEC approves suspending of the analytical sampling of monitoring wells MW-8 and MW-9. Due to the increase in GRO contamination in MW-7 during the last monitoring event, ADEC requests that semi-annual monitoring continue to be conducted at this site in monitoring wells MW-7 for BTEX, GRO, and DRO, and in monitoring well MW-26 for BTEX and GRO. Based on the results of future monitoring events further reductions in groundwater monitoring and/or cleanup completed status for this site may be approved. Robert Weimer
10/3/2011 Site Characterization Report Approved June 10, 2010 groundwater monitoring event. Up to 4.19 mg/l GRO, 1.42 mg/l DRO, and 8.2 ug/l benzene were found in the groundwater. The contamination concentrations have increased from the previous sampling event in one monitoring well (MW-7). The groundwater was at 15.10 to 15.96 feet below ground surface and flows toward the north by northwest. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
6/28/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
10/3/2014 Update or Other Action ADEC has not received the requested semi-annual groundwater monitoring reports since June 2010. ADEC letter requesting submittal of reports of any groundwater monitoring conducted since then with the next semi-annual monitoring event being conducted and the result submitted by December 3, 2014. Need to sample monitoring wells MW7 and MW26 for BTEX, GRO, and DRO. Robert Weimer
3/20/2015 Update or Other Action Update from consultant (BGES) they are to conduct another groundwater monitoring event soon and submit a report of the results. Based on the results of that sampling event and the sampling conducted in October 2014 the ADEC will evaluate the site for corrective action complete with institutional controls status (closure with ICs). May need additional groundwater monitoring before closure with ICs or long-term groundwater monitoring as part of the closure with ICs. Robert Weimer
6/1/2015 Document, Report, or Work plan Review - other October 31, 2014 groundwater monitoring event. Up to 0.135 mg/l GRO, non-detect (<0.694 mg/l) DRO, and 1.04 ug/l benzene were found in the groundwater. The contamination concentrations have decreased from the previous sampling event in the two monitoring wells sampled (MW-7 and MW-26). The groundwater was at 12.11 to 12.62 feet below ground surface and flows toward the north by northwest. All groundwater contamination appears to be confined to the car wash property. The groundwater samples were collected by a bladder pump after purging. They were collected from the top of the water column as required. Robert Weimer
6/2/2015 Document, Report, or Work plan Review - other December 31, 2014 groundwater monitoring event. Up to 0.135 mg/l GRO, non-detect (<0.694 mg/l) DRO, and 1.04 ug/l benzene were found in the groundwater. The contamination concentrations have decreased from the previous sampling event in two monitoring wells sampled (MW-7 and MW-26). The groundwater flows toward the north by northwest. All groundwater contamination appears to be confined to the car wash property. Robert Weimer
6/3/2015 Document, Report, or Work plan Review - other March 23, 2015 groundwater monitoring event. Up to 0.307 mg/l GRO, non-detect (<0.694 mg/l) DRO, and 1.86 ug/l benzene were found in the groundwater. The contamination concentrations have increased from the previous sampling event in one (MW-7) of the two monitoring wells sampled (MW-7 and MW-26).The groundwater was at 12.98 to 13.46 feet below ground surface and flows toward the north by northwest. All groundwater contamination appears to be confined to the car wash property. The groundwater samples were collected by a bladder pump after purging. They were collected from the top of the water column as required. Robert Weimer
6/5/2015 Update or Other Action DEC is requesting a June 2015 groundwater monitoring event of monitoring wells MW-7, MW-9, and MW-26 for BTEX, GRO, and DRO and confirmation soil sampling (in accordance with an approved confirmation soil sampling work plan) to evaluate current soil concentrations to evaluate this site for closure with ICs. Robert Weimer
11/20/2015 Document, Report, or Work plan Review - other DEC approval of the November 2015 Confirmation Soil Sampling Activities work plan. The plan proposes to collect soil samples from seven soil borings at areas of the site that had previously identified contamination above site cleanup levels. Robert Weimer
12/2/2015 Update or Other Action DEC approves request to move the proposed boring near monitoring well MW-9 about 12 feet to the south because a large planter is covering the original proposed location and nearby buried electrical. Robert Weimer
7/11/2016 Document, Report, or Work plan Review - other July 1, 2015 groundwater monitoring event. Up to 0.369 mg/l GRO, non-detect DRO, and 2.78 ug/l benzene were found in the groundwater. The contamination concentrations have increased from the previous sampling event in one (MW-7) of the three monitoring wells sampled (MW-7, MW-9, and MW-26). The groundwater was at 13.37 to 13.84 feet below ground surface and flowed generally toward the northwest this monitoring event. All groundwater contamination appears to be confined to the car wash property. The groundwater samples were collected by a bladder pump after purging. They were collected from the top of the water column as required. Robert Weimer
7/11/2016 Document, Report, or Work plan Review - other On December 2, 2015 seven soil borings were sampled to help assess current soil contamination concentrations at the site. Up to 545 mg/kg GRO, 619 mg/kg DRO, 2.37 mg/kg benzene, 7.34 mg/kg 2-methylnapthalene, and 2.15 mg/kg naphthalene. Robert Weimer
7/11/2016 Meeting or Teleconference Held DEC requests work plan for conducting groundwater sampling of monitoring well MW-7 for BTEX, GRO, and PAHs. The new consultant RESCON will provide a brief work plan for the groundwater sampling procedures. After reviewing the results of this groundwater sampling DEC will determine what additional work is needed for site closure. Robert Weimer
11/8/2016 Document, Report, or Work plan Review - other DEC approves the revised November 8, 2016 groundwater monitoring work plan for the groundwater sampling of monitoring well MW-7, which is scheduled for November/December of 2016. Robert Weimer
11/3/2017 Update or Other Action Update from consultant that the requested groundwater sampling was conducted on June 12, 2017 and a report of the results is to be submitted soon. Robert Weimer
4/10/2018 Offsite Soil or Groundwater Disposal Approved Two gallons of purge water was transported to and treated at NRC Alaska. Robert Weimer
1/3/2019 Document, Report, or Work plan Review - other June 12, 2017 groundwater monitoring event. Up to 0.494 mg/l GRO and 4.22 ug/l benzene were found in the groundwater. Only one monitoring well (MW-7) was sampled this monitoring event. The groundwater was at 12.89 feet below ground surface and has historically flowed toward the north and northwest. The groundwater sample was collected by a bladder pump after purging from the top of the water column as required. Robert Weimer
1/30/2019 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77983 1989 UST contamination. Robert Weimer
5/13/2019 Update or Other Action To prepare the site for closure DEC requested a work plan for the decommissioning the remaining site monitoring wells. Robert Weimer
5/29/2020 Update or Other Action A well decommissioning workplan was submitted. Review of the workplan has been delayed until additional groundwater samples are collected (see 6/16/2020 action). Janice Wiegers
6/16/2020 Update or Other Action DEC reviewed groundwater monitoring results and calculated cumulative risk associated with the remaining contaminants. As the cumulative risk associated with groundwater exceeds the risk standards, DEC cannot close the site at this time without institutional controls and a covenant on the groundwater. DEC notified the consultant, RESCON, and recommended an additional round of groundwater sampling. Janice Wiegers
8/16/2023 Update or Other Action Rescon submitted a Vapor Intrusion Workplan for sampling indoor air and three subslab soil gas samples beneath the buildling. DEC approved the workplan on 8/28/2023. Janice Wiegers
10/24/2023 Document, Report, or Work plan Review - other Vapor intrusion and groundwater monitoring report submitted for field activities in September 2023. Groundwater samples were collected from MW-7 and tested for GRO, VOCs, and PAHs. No contaminants exceeded groundwater cleanup levels. Indoor air and 3 subslab soil gas samples were also collected. A variety of compounds were detected in these samples which are likely associated with use of the building as a car wash, automotive shop, and laundromat. All indoor air and soil gas results were below DEC commercial target levels. One subslab soil gas sample, collected from the western portion of the building, contained PCE above residential target levels. Janice Wiegers
6/10/2024 Update or Other Action Groundwater monitoring and vapor intrusion report, dated 10/20/2023, was resubmitted to correct an error in the subslab soil gas level listed for acrolein - DEC guidance does not list a target level for this compound. Janice Wiegers
6/27/2024 Cleanup Complete Determination Issued DEC reviewed the information available for the site and determined that the cleanup is complete. Petroleum contamination may remain in soil beneath 5 feet below ground surface. DEC approval is need to move contamination soil off the site. Janice Wiegers

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 2.37 mg/kg in SB&C-5-1202 in 2015.
Ethylbenzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 3.67 mg/kg in SB&C-5-1202 in 2015.
Xylenes (total) Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 7.67 mg/kg in SB&C-5-1202 in 2015.
GRO > Human Health/Ingestion/Inhalation Soil Present at 545 mg/kg in SB&C-5-1202 in 2015.
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 619 mg/kg in SB&C-5-1202 in 2015.
Naphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 2.15 mg/kg in SB&C-5-1202 in 2015.
2-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 7.34 mg/kg in SB&C-5-1202 in 2015.
1-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Present at 4.86 mg/kg in SB&C-5-1202 in 2015.

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

No associated sites were found.

Missing Location Data

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